Electric railway-brake.



No. 768,634. I PATENTED AUG. 30,1904.

L. L. STAMM.

ELECTRIC RAILWAY BRAKE.

AP PLIOATION FILED DEC. 8, 1903. NO MODEL. 2 SHEETS-SHEET .1.

avwew foz q/v-i kmeooeo Q v W E 1 1 illtomuu o No. 768,634. PATEN'TED AUG. 30, 1904.

I L. L. ISTAMM.

ELEGTRIG RAILWAY BRAKE.

APPLICATION FILED DEC. 8, 1903.

NO MODEL.

Svwehfoz U ITED STAT S Patented August so, 1904..-

PATENT OFFICE.

LEVI L. STAMM, E ALMOND, NEW YORK, ASSIGNOR TO EARTZ, WYGANT AND BROWN, INCORPORATED, OF HORNELLSVILLE, NEW YORK, A

CORPORATION OF NEW YORK.

ELECTRIC RAILWAY-BRAKE SPECIFICATION forming part of Letters Patent No. 768,634, dated August 30, 1904.

Application filed December 8, 1908. Serial No. 184,296. (No model.) I

To all whom it may concern.-

Be it known that I, LEVI L. STAMM, a citizen of the United States, residing at Almond, in the county of Allegany and State of New York, have invented an Electric Railway-Brake, of which the following is a full, clear, and exact description. I v

The object of this invention is to provide a railway-brake especially adapted for electricarrangement, and combination of the parts constituting the invention, all as hereinafter fully described, and more specifically set forth in the appended claims. 1

In the accompanying drawings,whioh form a part of this specification, Figure 1 is a diagram view illustrating the application of the invention. Fig. 2 is an enlarged view in elevation showing the brake-shaft and its con nections. Fig. 3 is a similar view of the sectional power-shaft. Fig. 4 is a face view of the driving-wheel carried bythe motor-driven section of the power-shaft. Fig. 5 illustrates face views of the solid wheel or disk which is interposed between the wheels on the motordriven and transmission sections of the powerdriven shaft. Fig. 6 is a face View of the wheel which is carried by the transmissionsection of the power-shaft.

Similar letters of reference indicate similar parts in all the figures of the drawings.

In carrying out my invention I employ in the first instance an electric motor which is of the usual pattern and is inclosed in asuitable casing A, securely bolted to the under side of the car; but inasmuch as I lay no claim to the construction of the motor-merely its combination with the other partsan'y style of electric motor may be employed suitable for the purpose, and, as shown in. the diagrammatic View, Fig. 1, its operations are controlled by the controller or double-throw switch B, which latter is duplicated at either end of the car, as is usual. 1

O designates the motor-driven section of the power-shaft, which is suitably journaled in the casing A and at one end extends beyond the same. On a line with this shaft and journaled in a hanger E is the transmission-shaft D, which latter is provided with a Worm (Z, in mesh with a worm-wheel F on the brake-shaft Gr. The hanger E is bolted to the under side starting up the other section, for the purpose hereinafter set forth. To accomplish this, the contiguous ends of the shafts C and D are provi'ded with similar wheels G and D, respectively, fixed thereto and connected to an interposed solid wheel or disk H, the connection being by means, of studs o and d, projecting from the faces of thewheels O and D, respectively, and engaging openings or recesses therefor in the opposite faces of the aforementioned solid wheel or disk H. The latter is preferably composed of an insulating material, and in the face of the same, which is opposed to the face of the wheel C, are formed semicircular recesses h it, which are concentric with the axis of the disk and in which travel the lugs c 0 on said wheel (1. Seated in these recesses are helical expansion-springs I, against one end of which the said lugs are adapted to bear, and said springs are disposed in the recesses with respect to the lugs so that they will be compressed by the latter when the motor-driven section of the powershaft is turned in the direction to set the brakes.

The brake-shaft Gris journaled in hangers J J, bolted to the under side of the car, and loosely mounted on said shaft is the wormwheel F, hereinbefore mentioned, and at one Beyond the ratchet-wheel there is latter is connected to the collar Z: of the ratchet-wheel, while the other end is attached to the brake-lever M. This brake-chain is provided with an extension-spring m, formingapart thereof and adapted to yield or give when the brakes are set and permit of a yielding pressure of the brake-shoes on the wheels.

In order to provide for automatically cutting out the circuit after the brakes are fully set, and thereby prevent the operator from sticking the motor and burning it out, I employ a chain or flexible connection a, which is attached at one end to the brake-shaft G and at the other end to a spring-actuated lever 00f the cut-out O, the said chain being wound upon the shaft as the same is rotated to set the brakes and is of such length that when the brakes are fully set it will operate the cut-out.

The operation of the brake mechanism will be readily understood from the foregoing deing drawings, for when the electric motor is started up the shaft G will be turned until the springs I of the shaft connection are compressed to the extent of imparting the motion of the shaft C to the shaft I), when the worm-wheel F will be turned by the worm (Z, and the pawls on said worm-wheel engaging the ratchet-wheel K will turn the shaft G, to which said ratchet-wheel is fixed, thus winding the brake-chain on said shaft and applying the brakes. If the brakes are fully set, the chain 7'1 will operate the cut-out, and the mechanism will be held by the motor until the current is shut off by the controller. In releasing the brakes the motor is reversed, and the spring which returns the brake-beam to its normal position will operate to unwind the chain from the brake shaft, in which latter operation the shaft G is permitted to turn backward to its proper extent.

The particular construction of the shaft connection permits the motor to be started up before the brake mechanism is put in motion, and when the parts are in their normal con dition, with, the brake mechanism released, the springs I will be expanded and the lugsc then located in the ends b of the semicircular recess h, so that the shaft (J may be turned or started before the shaft D.

Having thus described my invention, what shafts, one of the wheels having semicircular recesses and lugs on the other wheel traveling in said semicircular recesses and by which said shafts are connected to permit a limited movement of the motor-shaft in advance of the other shaft, and helical springs mounted in the recesses between the end walls thereof and the aforesaid lugs, substantially an interposed solid wheel or disk having rc- I claim as new, and desire to secure by Letters Patent, is

bination, of an electric-motor and its shaft, a shaft forming part of the gearing to the brakeshaft, wheels on the contiguous ends of said cesses with whichsaid lugs engage, the recesses in one face of the disk being semicircular to permit of a movement of one section of the shaft in advance of the other, substantially as shown and for the purpose set forth.

3. In an electric brake mechanism, the combination, of a power-shaft comprising two sections, wheels on the contiguous ends of said shafts and provided with projecting lugs, an interposed solid wheel or disk of insulating material having recesses with which said lugs engage, the recesses in one face of the disk being semicircular to permit of a movement of one section in advance of the other, and scription in connection with the accompanysprings seated in said semicircular recesses and against which the lugs bear when the shaft is turned to set the brakes, substantially as shown and for the purpose set forth.

4. In an electric brake mechanism, the combination, of the power-shaft comprising two sections, wheels on the contiguous ends of said shafts and provided with projecting lugs,

, an interposed solid wheel or disk having recesses with which said lugs engage, the recesses in one face of the disk being semicircular to permit of a movement of one section in advance of the other section, and springs seated in said semicircular recesses and against which the lugs therein hear when the shaft is turned to set the brakes; together with a worm on the power-shaft, a brake-shaft having a worm-wheel loosely mounted thereon and in mesh with the aforesaid worm, a ratchet-wheel on the brake-shaft, and pawls on the worm-wheel in engagement with the ratchet-wheel.

5. In an electric brake mechanism, the combination, of the power-shaft comprising two sections, wheels on the contiguous ends of said sections and provided with projecting lugs, an interposed solid wheel or disk having recesses with which said lugs engage, the recesses in one face of said disk being semicircular to permit movement of one of the sections of the power-shaft in advance of the other section thereof, and springs seated in said semicircular recesses and against which 1. In an electric brake mechanism, the coml l i l the lugs therein bear when the shaft is turned to set the brakes; together with the brakeshaft and gearing between the same and the power shaft, a chain extending from the brake-shaft to the brake-lever, and an extension-spring forming a part of said chain, sub

stantially as shown and for the purpose set forth.

6. In an electric brake mechanism, the combination with an electric motor and its shaft, a brake-shaft geared to the aforesaid shaft, a cut-out having a spring-actuated lever, and a chain or flexible connection between said lever and the brake-shaft, substantially as shown and for the purpose set forth.

7 In an electric brake mechanism, the combination, of the electric motor and'its shaft,

7 a controller for said motor, gearing between the shaft and brake-shaft, a chain extending from said brake-shaft to the brake-lever, a cut-out for the motor, a spring-actuated lever for operating the cut-out, and a chain or flexible connection attached 'to the, lex er and to the brake-shaft, substantially as shown and for the purpose set forth.

' In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

LEVI L. STAMM.

Witnesses:

E. D. LEWIS, LEMAN MARKHAM. 

